C ++ 12 All Practical Questions Answers 2022 || Technology369kk
Answers C++ Practical
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Q1. Write a C++ Program to display Names, Roll No and grades of 3 students who have appeared in the examination. Declare the class of name, roll no and grade.
Program :-
#include<iostream>
using namespace std;
class Students{
char stud_name[50];
int stud_roll;
char stud_grade[2];
public:
void read_data(int count){
cout<<"\n******Enter Student "<<count+1<<" Information*******"<<endl;
cout<<"Name of Student:";
cin>>stud_name;
cout<<"Roll Number of Student:";
cin>>stud_roll;
cout<<"Enter Student Grade(O, A+, A, B+, B, C, D, F ):";
cin>>stud_grade;
cout<<"Student Information of "<<stud_name<<" has been successfully saved"<<endl;
cout<<"************************************"<<endl;
}
void disp_data(int count){
cout<<"\n******Student "<<stud_name<<" Information*****"<<endl;
cout<<"Name of Student:"<<stud_name<<endl;
cout<<"Roll of Student:"<<stud_roll<<endl;
cout<<"Grade of Student:"<<stud_grade<<endl;
}
};
int main(){
Students obj[3];
int i;
for(i=0; i<3; i++)
obj[i].read_data(i);
cout<<"\n\n +++++++++++++++++++++++++++++++++++++++++++++++\n";
cout<<"The information of 3 students has been saved.";
cout<<"\n+++++++++++++++++++++++++++++++++++++++++++++++\n";
for(i=0; i<3; i++)
obj[i].disp_data(i);
cout<<"Created by Shailesh"<<endl;
return 0;
}
Output:-
******Enter Student 1 Information*******
Name of Student:Shailesh
Roll Number of Student:82000
Enter Student Grade(O, A+, A, B+, B, C, D, F ):A
Student Information of Shailesh has been successfully saved
************************************
******Enter Student 2 Information*******
Name of Student:Anuu
Roll Number of Student:82001
Enter Student Grade(O, A+, A, B+, B, C, D, F ):B
Student Information of Anuu has been successfully saved
************************************
******Enter Student 3 Information*******
Name of Student:Priya
Roll Number of Student:82002
Enter Student Grade(O, A+, A, B+, B, C, D, F ):C
Student Information of Priya has been successfully saved
************************************
+++++++++++++++++++++++++++++++++++++++++++++++
The information of 3 students has been saved.
+++++++++++++++++++++++++++++++++++++++++++++++
******Student Shailesh Information*****
Name of Student:Shailesh
Roll of Student:82000
Grade of Student:A
******Student Anuu Information*****
Name of Student:Anuu
Roll of Student:82001
Grade of Student:B
******Student Priya Information*****
Name of Student:Priya
Roll of Student:82002
Grade of Student:C
Created by Shailesh
--------------------------------
Process exited after 67.38 seconds with return value 0
Press any key to continue . . .
Q2. Create an array of class objects. Read and display the contents of the array.
Program :-
class Student{
char name[30];
int marks, roll;
public:
void getdata(){
cout<<"\t********Enter Information of Students********"<<endl;
cout<<"Enter Student Name:";
cin>>name;
cout<<"Enter Student Marks:";
cin>>marks;
cout<<"Enter Student Roll:";
cin>>roll;
cout<<endl;
}
void showdata(){
cout<<"\t********Information of Students********"<<endl;
cout<<"Student Name:"<<name<<endl;
cout<<"Student Marks:"<<marks<<endl;
cout<<"Student Roll Number:"<<roll<<endl;
cout<<endl;
}
};
int main(){
Student s1[30];
int i,n;
cout<<"\nEnter Number of Students:";
cin>>n;
for(i=0; i<n; i++)
s1[i].getdata();
cout<<"\n*******Students Infromation********\n"<<endl;
for(i=0; i<n; i++)
s1[i].showdata();
return 0;
}
*************Output***************
Enter Number of Students:2
********Enter Information of Students********
Enter Student Name:Shailesh
Enter Student Marks:456
Enter Student Roll:78546
********Enter Information of Students********
Enter Student Name:Annu
Enter Student Marks:789
Enter Student Roll:85202
*******Students Infromation********
********Information of Students********
Student Name:Shailesh
Student Marks:456
Student Roll Number:78546
********Information of Students********
Student Name:Annu
Student Marks:789
Student Roll Number: 85202
Q3. Write a C++ program to declare Struct. Initialize and display contents of member variables..
Program :-
struct Studentss{
string name;
int roll;
int marks;
string branch;
};
int main(){
struct Studentss stud1, stud2;
cout<<"\n******Enter Student 1 Information******"<<endl;
cout<<"Enter Your Name:- ";
cin>>stud1.name;
cout<<"Enter Your Roll Number:-";
cin>>stud1.roll;
cout<<"Enter Your Marks :- ";
cin>>stud1.marks;
cout<<"Enter Your Branch:- ";
cin>>stud1.branch;
cout<<"\n******Enter Student 2 Information******"<<endl;
cout<<"Enter Your Name:- ";
cin>>stud2.name;
cout<<"Enter Your Roll Number:-";
cin>>stud2.roll;
cout<<"Enter Your Marks :- ";
cin>>stud2.marks;
cout<<"Enter Your Branch:- ";
cin>>stud2.branch;
cout<<"\n******Student 1 Information has been Successfully Saved*****"<<endl;
cout<<"Your Name is:- "<<stud1.name<<endl;
cout<<"Your Roll Number is:- "<<stud1.roll<<endl;
cout<<"Your Marks is:- "<<stud1.marks<<endl;
cout<<"Your Branch is:- "<<stud1.branch<<endl;
cout<<"\n******Student 2 Information has been Successfully Saved*****"<<endl;
cout<<"Your Name is:- "<<stud2.name<<endl;
cout<<"Your Roll Number is:- "<<stud2.roll<<endl;
cout<<"Your Marks is:- "<<stud2.marks<<endl;
cout<<"Your Branch is:- "<<stud2.branch<<endl;
return 0;
}
If You Want Find Struct Features these types it is a basic Syntax:-
// This is just demo of better rule for find structure features.
struct name{
char nm[50];
int age;
};
int main(){
struct name info;
cout<<"*******Enter your Personal Details******"<<endl;
cout<<"Enter your name:- ";
cin>>info.nm;
cout<<"Enter age:-";
cin>>info.age;
cout<<"\n \n*******Your Personal Details******"<<endl;
cout<<"your Name:- "<< info.nm<<endl;
cout<<"your Age:- " <<info.age<<endl;
return 0;
}
************Output************
*******Enter your Personal Details******
Enter your name:- Shailesh
Enter age:-45
*******Your Personal Details******
your Name:- Shailesh
your Age:- 45
--------------------------------
Process exited after 9.392 seconds with return value 0
Press any key to continue . . .
Q4. Write a c++ program to implement Constructors and destructor.
Program :-
// Implement of Constructor
class Constructor{
int c;
public:
Constructor(int a, int b){
c=a+b;
}
void show(){
cout<<"Addition of a and b:"<<c<<endl;
}
};
int main(){
Constructor obj(5,6); // Normall parametrized Constr
obj.show();
Constructor obj2=obj;
obj2.show(); //but this is copy Constr
return 0;
}
Implement of destructor :
// Example of Destructor
class Destructor{
int a, b;
public:
~Destructor(){
cout<<"Enter A value:";
cin>>a;
cout<<"Enter B Value:";
cin>>b;
cout<<"Before Swapping value a and b"<<endl;
cout<<"A="<<a<<"\t"<<"B="<<b<<endl;
a=a+b;
b=a-b;
a=a-b;
cout<<"After Swapping Value is a and b"<<endl;
cout<<"A="<<a<<"\t"<<"B="<<b<<endl;
}
};
int main(){
Destructor d;
}
Q5. Write a c++ program to compare two objects using friend function.
Program :-
class Text{
private:
int x,y; // instance of two
public:
Text(int a, int b){
cout<<"Enter a number=";
cin>>x;
cout<<"Enter b number=";
cin>>y;
}
void show(){
if(x>y){
cout<<"A is greatest with B"<<endl;
}
else{
cout<<"B is greatest with A"<<endl;
}
}
friend void show(Text);
};
int main(){
Text t1(0,0);
cout<<"Normal Constructor"<<endl;
t1.show();
Text t2=t1;
cout<<"Copy Constructor"<<endl;
t2.show();
return 0;
}
Q6. Write C++ program for unary increment (++) and decrement (--) operator overloading.
Program :-
//Example of unary increment(++).
class Unyin{
private:
int num;
public:
Unyin():
num(10){
//blanck function
}
void operator ++(){ // increment operator add
num= num+2;
}
void print(){
cout<<"The Current Value : "<<num;
}
};
int main(){
Unyin in;
++in; //
in.print();
return 0;
}
//Example of unary decrement(--).
class Unydec{
private:
int num;
public:
Unydec(): num(10){
//empty function
}
void operator --(){ // decrement operator substraction
num=num-1;
}
void print(){
cout<<"The Current Value : "<<num;
}
};
int main(){
Unydec in;
--in; //
in.print();
return 0;
}
Q7. Implement operator overloading to add two complex numbers.
Program :-
class Complex{
public:
int real, img;
Complex(){
real=0;
img=0;
}
Complex (int r, int i){
real=r;
img=i;
// cout<<"Enter Real Number two times"<<endl;
// cin>>real;
// cout<<"Enter Imaginerry Number two times:"<<endl;
// cin>>img;
}
Complex add(Complex c1, Complex c2){
Complex res;
res.real= c1.real + c2.real;
res.img= c2.img + c2.img;
return res;
}
};
int main(){
Complex c1(20, 10);
cout<<"Complex Number c1: "<<c1.real<<" +i"<<c1.img<<endl;
Complex c2(30,45);
cout<<"Complex Number c2: "<<c2.real<<" +i"<<c2.img<<endl;
Complex c3;
c3= c3.add(c1 , c2);
cout<<"Add of two Complex Number:"<<c3.real<<"+i"<<c3.img<<endl;
return 0;
}
Q8. C++ program to demonstrate example of Copy Constructor.
Program :-
class Copy{
int c;
public:
Copy(int a, int b){
cout<<"Enter a Number:";
cin>>a;
cout<<"Enter b Number";
cin>>b;
c=a+b;
}
void disp(){
cout<<"Sum of a and b:"<<c<<endl;
}
};
int main(){
Copy c1(0,0);
cout<<"Normal Constructor Value."<<endl;
c1.disp();
Copy c2=c1;
cout<<"Copy Constructor Value."<<endl;
c2.disp();
return 0;
}
Q9. Count the created objects using static member function in C++.
Hints :- Static: It is a keyword refers that memory management in HDD and memory efficient manage because static means fix of value. An Example For Better Understanding.
Program :-
class Student{
public:
string name;
int marks,roll;
static int count;
void getS(){
cout<<"Enter Student Name:"<<endl;
cin>>name;
cout<<"Enter Student Roll Number:"<<endl;
cin>>roll;
cout<<"Enter Student Marks:"<<endl;
cin>>marks;
}
void showS(){
cout<<"Student Name is :"<<name<<endl;
cout<<"Student Roll is :"<<roll<<endl;
cout<<"Student Marks is :"<<marks<<endl;
}
Student(){
count++;
}
};
int Student::count=0;
int main(){
static Student s1,s2,s3;
s1.getS();
s1.showS();
cout<<"Number of Object is:"<<Student::count;
return 0;
}
// Same Program but using this keyword
class Stud{
public:
string name;
int roll, marks;
static string branch;
Stud(string name, int roll, int marks){
this->name=name;
this->roll=roll;
this->marks=marks;
}
void disp(){
cout<<"Student Information : "<<"Name of Student:-"<<name<<"\t "<<
"Roll Number of Student:-"<<roll<< "\t"<<"Marks of Student:-"<<marks<<"\t"<<
"and Branch Name:-"<<branch<<endl;
}
};
string Stud::branch="BCA";
int main(){
Stud s1("Shailesh",85205, 456);
Stud s2("Annu ",85555,468);
s2.disp();
s1.disp();
return 0;
}
10.Write code to implement dynamic polymorphism.
Hints :- Polymorphism:- It means that one man many name.
Dynamic polymorphism also known as runtime poymorphism or late-banding poymorphism: In this case same name as funtion name and function arguments
Program :-
class Base{
public :
int a,b, c;
void add(){
a=10;
b=20;
c=a+b;
cout<<"Addition value of a and b(Base Class): " <<c<<endl;
}
};
class Derived: public Base{
public :
int c,a,b;
void add(){
a=10;
b=5;
c=a+b;
cout<<"Addition value of a and b (Derived Class):" <<c<<endl;
}
};
int main(){
Base *b; // Base class of Pointer
Derived d; //Derived class of object
b=&d; // base class object access derived objects
b->add(); // call base class functions
// If you print both class value then create two object
// Base b;
// Derived d;
// b.add();
// d.add();
return 0;
}
11. Create function template to perform addition for two different numbers.
Hints :- Template:- It is a generic programming methods in c++,
Generic program means:- It means that which type of function pass in the functions or class then execute these type of program.
Let's see an example of function template find add program.'
Program :-
//Just Demo: ---
template <class T>
void add(T a , T b){
cout<<"Addition ="<<a+b<<endl;
}
int main(){
add(3,5);
return 0;
}
//Now come to the main Point :-find add program diffrent words integer and float or double with template class and function
template < class T1, class T2>
class Temp{
T1 a;
T2 b;
public :
Temp(T1 x, T2 y){
a=x;
b=y;
}
void show(){
cout<<"\n \n*********INTEGER TYPE VALUE**********"<<endl;
cout<<"Addition of a and b= "<<a+b<<endl;
cout<<"Substraction of a and b= "<<a-b<<endl;
}
void anot(){
cout<<"\n \n*********FLOAT TYPE VALUE**********"<<endl;
cout<<"Addition of a and b= "<<a+b<<endl;
cout<<"Substraction of a and b= "<<a-b<<endl;
}
};
int main(){
Temp< int, int > t1(5,2);
Temp< float, float > t2(7.2, 8.1);
t1.show();
t2.anot();
return 0;
}
12.Write code to store roll and name of student in a file and print back.
Hints :- File Handling Process finds this problem.
Data Type Description
fstream It is used to create files, write information to files, and read information from files.
ifstream It is used to read information from files.
ofstream It is used to create files and write information to the files.
Program :-
#include<iostream>
#include<fstream>
using namespace std;
int main(){
int roll;
int marks;
string name;
string branch;
ofstream file("Demo.txt");
if(file.is_open())
{
cout<<"\n********Please Input Your Vailed Information Because you are a Student*******"<<endl;
cout<<"Enter Your Full Name : ";
getline(cin, name);
cout<<"Enter Your Roll Number:";
cin>>roll;
cout<<"Enter Your Marks: ";
cin>>marks;
cout<<"Enter Your Branch: ";
cin>>branch;
file<<"You are Student of the 2nd year your details:- "<<endl;
file<<"Your Full Name is: "<<name<<endl;
file<<"Your Roll Number is: "<<roll<<endl;
file<<"Your Marks is: "<<marks<<endl;
file<<"Your Branch Name: "<<branch<<endl;
file.close();
cout<<("\n********File Create and Write Details of Students is Process Done!******")<<endl;
}
else{
cout<<"File Openning Process failed!"<<endl;
}
ifstream is;
string line;
is.open("Demo.txt");
cout<<"\n*******File(Demo.txt) Read Of Students Infromations Show*****\n"<<endl;
while(getline(is,line)){
cout<<line<<endl;
}
is.close();
return 0;
}
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